Exoplanet · Earth-sized rocky planet
Kepler-138 e
Kepler-138 e is a Earth-sized rocky planet orbiting the star Kepler-138. Its year lasts 38.2 Earth days. It was discovered in 2022 by the Transit Timing Variations method.
| Host star | Kepler-138 |
|---|---|
| Distance | 218.1 light-years (66.9 pc) |
| Orbital period | 38.2 days |
| Orbital radius | 0.18 AU |
| Eccentricity | 0.112 |
| Radius | 0.797 R⊕ · 0.0711 R♃ |
| Mass | 0.43 M⊕ · 0.00135 M♃ |
| Density | 4.67 g/cm³ |
| Surface gravity | 0.677 × Earth |
| Equilibrium temperature | 292 K (19 °C) |
| Stellar flux received | 1.73 × Earth |
| Discovery method | Transit Timing Variations |
| Discovery year | 2022 |
| Discovered by | Multiple Observatories |
Habitable zone
At the edge of the habitable zone (within the optimistic limits): liquid water would be possible only with a favourable atmosphere.
Its star in the sky
In the planet's sky its star is a disc 1.6° across: 3 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 13.13. Visible from the whole Northern Hemisphere and south to latitude 47° S. North of latitude 47° N it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1808. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.9 million years.
Planets in the same system
- Kepler-138 b 10.3-day orbit · 0.64 R⊕
- Kepler-138 c 13.8-day orbit · 1.51 R⊕
- Kepler-138 d 23.1-day orbit · 1.51 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.